Synthesis of hollow cobalt oxide nanopowders by a salt-assisted spray pyrolysis process applying nanoscale Kirkendall diffusion and their electrochemical properties

Hyeon Seok Ju, Jung Sang Cho, Jong Hwa Kim, Yun Ju Choi, Yun Chan Kang

    Research output: Contribution to journalArticlepeer-review

    12 Citations (Scopus)

    Abstract

    A new concept for preparing hollow metal oxide nanopowders by salt-assisted spray pyrolysis applying nanoscale Kirkendall diffusion is introduced. The composite powders of metal oxide and indecomposable metal salt are prepared by spray pyrolysis. Post-treatment under a reducing atmosphere and subsequent washing using distilled water produce aggregation-free metal nanopowders. The metal nanopowders are then transformed into metal oxide hollow nanopowders by nanoscale Kirkendall diffusion. Co 3 O 4 hollow nanopowders are prepared as first target materials. A cobalt oxide-NaCl composite powder prepared by spray pyrolysis transforms into several Co 3 O 4 hollow nanopowders by several treatment processes. The discharge capacities of the Co 3 O 4 nanopowders with filled and hollow structures at a current density of 1 A g -1 for the 150th cycle are 605 and 775 mA h g -1 , respectively. The hollow structure formed by nanoscale Kirkendall diffusion improves the lithium-ion storage properties of Co 3 O 4 nanopowders.

    Original languageEnglish
    Pages (from-to)31988-31994
    Number of pages7
    JournalPhysical Chemistry Chemical Physics
    Volume17
    Issue number47
    DOIs
    Publication statusPublished - 2015 Jan 1

    ASJC Scopus subject areas

    • General Physics and Astronomy
    • Physical and Theoretical Chemistry

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